2014 Poster_3_6

Jun 14, 20160 likes42 views

This study examines manufacturing thin steel sheets through direct strip casting (DSC), which simplifies production and reduces energy consumption by 90% compared to conventional methods. DSC results in a microstructure with an average grain size of 55 μm. Atom probe tomography revealed nano-scale vanadium-rich clusters not observable through transmission electron microscopy. These clusters are responsible for retarded recrystallization and fine grains during rolling and annealing of vanadium-alloyed strip cast steels. The project investigates the influence of solute elements like carbon and vanadium on microstructural development during strip casting and secondary processing through a multi-scale approach.

This study examines the possibility of manufacturing thin sheets of steel in an environmental friendly manner and properties that are
superior to conventionally manufactured ones.
APT revealed the presence of nano-scale Vanadium rich clusters that were
not observable using TEM. Concurrent precipitation of these clusters in
vanadium alloyed strip cast steels are responsible for the retarded
recrystallization and fine grains.
20 nm
Deakin University CRICOS Provider Code: 00113B
INTRODUCTION
Out of 1.4 billion tonnes of steel manufactured every year, almost 50% are thin flat products. Conventional manufacturing methods demand
nearly 1.8x109 Joules of energy to produce one ton of thin strip steel. Alternatively, to eliminate the energy intensive processes, a new and
emerging technology is manufacturing steel sheets directly from molten metal by Direct strip casting (DSC). DSC process not only simplifies
the production route but also reduces the energy consumption by 90%, thereby reducing the harmful impact on environment. However,
rapid conversion of liquid steel into thin steel strips generally results in microstructures and mechanical properties that are different to
conventionally manufactured ones. Despite the significant benefits, current limited knowledge about the microstructural development
during strip casting and secondary processing is hindering the advancement of DSC process. This project aims to investigate the influence of
solute elements, mainly carbon and vanadium, in the microstructural development during strip casting and rolling-annealing process. A
multi-scale approach, from microscopic to atomic scale, is utilized to elucidate the solute behaviour in strip cast steels.
C-0.09,N-0.01 wt% and V-0.04 wt%
EBSD analysis showed that DSC produces a highly complex
microstructure with an average grain size of 55 µm.
0
0.2
0.4
0.6
0.8
1
1.E+1 1.E+3 1.E+5
FractionRecrsytallized
Time (s)
Recrystallization studies showed a significant difference in
kinetics as well as the grain size evolution due to Vanadium
addition.
0
10
20
30
40
50
60
70
Grainsize(µm)
0wt% V
0.04wt% V
0.04 wt% V
Strip-Cast
Recrystallized
0
2
4
6
8
10
12
14
16
-1 0 1 2 3
Concentration(at%)
Distance (nm)
C %
N %
P %
S %
Cu %
V %
ATOM PROBE TOMOGRAPHY
Effect of clusters in Direct Strip Cast steels
MAHENDRA RAMAJAYAM, A.Prof. NICOLE STANFORD & Prof. PETER HODGSON
Institute of Frontier Materials, Geelong Technology Precinct.
SIGNIFICANCE
RECRYSTALLIZATION
50% Cold Rolling + 650°C annealing
DSC MICROSTRUCTURE
Matrix Cluster

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01 Low Carbon South West january LCBB Uni of Bath kevin paine 21jan14The Future Economy Network

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Behavioural Investigation on the use of Nanosilica as An Additive in ConcreteIDES Editor

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Influence of Nano science in the Civil Engineering industry outbreaks significant solutions for numerous unidentified blending of materials evolve from a Nano product, which can create gigantic changes in the world of Concrete both technically and economically. The Significance of Nanosilica as an additive in my experimental research congeals the behaviour of Concrete considerably. Essential manipulations are carried out here by using a distinctive methodology and by conducting various tests to innovate a better performance concrete thereby found the enhancement of its property. Nano silica as an additive in added mainly to fill up the deviation arises with the addition of flyash, which consequently deviates the strength after its initial setting period. “Ref. [3]” This presence of Nanosilica constructs the silica (S) in the sand, which ultimately reacts with calcium hydrate (CH) in the cement at Nano scale to form C-S-H bond as its improve the strengthening factor of concrete, which are in turn helpful in the achieving high compressive strength even in early days. Here the addition of Nanosilica are done partially with an previously fly ash replaced concrete in a gradual basis, as the comparative results of a Fly ash concrete and Fly ash with Nanosilica added concrete are tested experimentally. The flexural behaviour of the Nano concrete found to be imperative part as analyzed from the Beam Column joint test setup. It has been clearly concluded in the results identified along with the ductility behaviour and the Load vs. Deflection analysis done for the specimen casted. The standard types of toughness test are carried out, which generated data under specific loading conditions with respect to their component design approaches. Also an overview on the experimental tests conducted in relation with the strength and durability of concrete were presented under the influence of Nanosilica in concrete.

Study of strength properties of concrete by using micro silica and nano silicaeSAT Publishing House

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Nanotechnology & Nano materials in concreteitis5

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Nano technology can significantly improve current construction problems and may change construction processes and requirements. Nanotechnology involves processing, separation, consolidation, and deformation of materials at the atomic scale. Using nano-particles in concrete can improve its bulk properties, strength, durability, and reduce environmental contamination. Common nano-materials used in concrete include carbon nano-tubes, nano-silica, and titanium oxide, which can increase strength, workability, and self-cleaning abilities. Preparing nano-concrete involves mixing cement, aggregates, and nano-materials. Nano-concrete offers benefits like increased strength, workability, corrosion resistance, and lower life-cycle costs.

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Reactive powder concrete (RPC) is a very strong and durable building material developed in the 1990s. It consists of a finely-ground mixture of cement, silica fume, quartz flour, water and steel fibers that is cured at a high temperature. RPC has extremely high compressive strength, even over 200 MPa, along with high flexural strength and very low permeability. It has been used in bridges, seawalls, buildings and other structures where high strength and durability are required. However, RPC is more expensive to produce than normal concrete due to its specialized composition and processing requirements.

Reactive powder concrete by N.RISHINATHRishi Nath

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RPC is an ultra-high strength concrete with improved properties achieved through enhanced homogeneity, compactness, and microstructure. It replaces coarse aggregates with fine powders and optimizes particle packing to increase density. Heat curing activates pozzolanic reactions and improves strength and durability. Steel fibers provide ductility. Two types of RPC exist - RPC 200 which achieves 200 MPa strength, and RPC 800 which uses stainless steel fibers and reaches 800 MPa through high temperature curing and applied pressure.

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This document summarizes a study on tungsten carbide-cobalt (WC-Co) composites. It discusses how WC-Co is widely used in cutting tools due to its hardness, strength and wear resistance. The document outlines how the abrasion resistance and fracture toughness of WC-Co are affected by the cobalt content and WC grain size. It also examines how additions of titanium carbide and tantalum carbide impact abrasion resistance. The synthesis, properties and applications of functionally graded WC-Co composites are presented. Areas for future work are identified, such as manufacturing techniques to make functionally graded WC-Co more cost effective for industries.

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Nano concrete is a type of concrete made with portland cement particles smaller than 500nm as the binding agent. Adding nano materials like carbon nanotubes, nano-silica, and polycarboxylates can improve properties of conventional concrete such as increasing compressive strength, reducing water needs, and improving workability. Nano concrete produces stronger, more durable concrete and reduces environmental impact by requiring less cement and additives.

Studies on Mechanical and Dry Sliding Wear Behavior of Nickel Coated Multiwal...IRJET Journal

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Factors affecting the strength of reactive powder concrete rpcIAEME Publication

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This document summarizes a study on factors affecting the strength of reactive powder concrete (RPC). RPC is an ultra-high strength concrete containing cement, silica fume, sand, quartz powder and steel fibers. The study developed RPC mixes with compressive strengths up to 150 MPa. It tested the effects of water-binder ratio, silica fume content, quartz powder addition, and high-temperature curing on compressive strength. The highest strength of 146 MPa was achieved. It was found that lower water-binder ratio, higher silica fume content, addition of quartz powder, and high-temperature curing increased compressive strength by up to 10%.

Flexural Behaviour of Steel Fibers Reinforced High Strength Self Compacting C...International Journal of Engineering Inventions www.ijeijournal.com

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experimental study on concrete using micro silica and nano silicaArmstra Junoly

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BEHAVIOR OF REACTIVE POWDER CONCRETE SLABS EXPOSED TO FIRE FLAMEIAEME Publication

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Behavior of carbon fiber reinforced polymer strengthened reactive powder conc...IAEME Publication

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high performance concretebeerappa143

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Concrete, Protect The Concrete From Corrosion, IDM8Qatar University- Young Scientists Center (Al-Bairaq)

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On the anodic reaction of the co2 corrosion process, Iron carbonate nucleatio...Omar Yepez, PhD

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The anodic reaction of the carbonic acid corrosion process controls the outcome of the degradation of the material. This is because it might produce an FeCO3 scale. In turn, the quality of this crystal will influence the corrosion rate. At the interphase, a colloid of iron carbonate forms. This is fed by Fe+2 coming from the metal dissolution and reacting with the HCO3- coming from the solution. In the colloid, different aggregates of iron carbonate molecules occur. This is until a critical nucleus of the siderite phase occurs, thus forming a siderite crystal. All parameters that normally affect corrosion rate, will affect directly the nucleation, growth and quality of this crystal. Particularly, the metal surface texture and pH of the solution. The nucleation of siderite was studied with anodic chronoamperometry at different surface textures and pH values. It was found that the surface texture is determinant on the law governing siderite nucleation and therefore its scale. FeCO3 formation is required but not sufficient to produce a protective siderite scale. Even after producing such scale, it needs to grow to a certain thickness to offer any protection. Higher pH and rougher surfaces help to achieve good protection. Weight loss corrosion rates measured in autoclave experiments, is controlled by the siderite nucleation phenomena occurring at the interphase.

Reactive Powder Concrete project jagniyant

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The document presents a project proposal to study the performance of reactive powder concrete (RPC) using locally available waste materials like foundry sand and fly ash. The objectives are to understand waste utilization and examine how RPC properties like strength and ductility are affected when mixed with these materials. A literature review found that foundry sand and fly ash can improve concrete strengths when substituted at certain percentages. The work plan outlines different mixes to be tested with varying replacement levels of foundry sand and fly ash. The project aims to provide insights into developing more sustainable RPC mixtures.

Effect of corroded reinforcement on structuresRini Dharva

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This document discusses the effect of corroded reinforcement on the aging of reinforced concrete structures. It describes the basic process of corrosion through oxidation and reduction reactions. Corrosion occurs due to carbonation, which decreases the pH of concrete, or chloride ingress from deicing salts or seawater. The service life of a structure can be divided into an initiation period and a propagation period. As corrosion increases, the bond strength between steel reinforcement and concrete decreases. The document reviews two papers, one that proposes a model and condition rating system to estimate residual service life, and another that examines deterioration in Mumbai due to chloride content, sulfate content, and pH levels.

Experimental study on corrosion prevention with rebars along with fibre in r ...eSAT Journals

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Abstract All materials or products, plants, constructions and building made of structural elements are subjected to physical wear during use. Corrosion is a multi- billion dollar problem. Corrosion causes deterioration of material and leads to destruction of structures ultimately affects the environment. Corrosion is a chemical or electrochemical phenomenon which can attack any metal or substances through reaction by the surrounding environment. The second is conservation, applied primarily to metal resources, the world’s supply of which is limited. The project is aimed at preventing corrosion that is minimising the rate of corrosion using polypropylene fibre and epoxy coating. In this work an attempt is planned to study the effects of fibres in concrete and to study the coating provided to the reinforcement. To accelerate the corrosion for a short term process of impressed current is induced. In this project it is aimed to study the effect of coating given to the reinforcement and effect of adding fibre in the concrete. Keywords: Fibre, Compressive Strength, Flexural Strength.

Concrete Corrosion of Reinforcing SteelSteven E. Kreeley, EIT

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The document discusses corrosion of steel reinforcement in concrete and methods to minimize it. It describes how carbonation and chloride attacks can cause corrosion through electrochemical processes. Various techniques are presented to mitigate corrosion, including using epoxy coatings on rebar, adding fibers or memory alloys to concrete, using admixtures, hybrid fiber reinforced concrete, and fiber reinforced polymers applied after corrosion begins. Ongoing research gaps and a proposed future study are also mentioned.

Reactive powder concrete.pptshruthicivil

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Reactive powder concrete (RPC) is an ultra-high-performance concrete with compressive strengths over 120,000 psi, tensile strengths of 3000-7000 psi, and flexural strengths of around 14,000 psi. It achieves these improved properties through a very dense mix of fine particles, silica fume, steel fibers, and a low water-to-cement ratio. RPC is nearly impermeable and durable, with low shrinkage and creep. Potential applications include structures requiring light, thin components like bridge and building components. However, RPC is very expensive to produce and no design codes currently exist for it.

EXPERIMENTAL STUDY OF EFFECT OF SODIUM SILICATE (NA2SIO3) ON PROPERTIES OF CO...IAEME Publication

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This paper aims to investigate the effect of use of sodium silicate in cold weather concreting. In order to illustrate such effect, a series of laboratory tests were conducted. Workability tests, compressive strength tests, flexural tests and split tensile strength tests were carried out on concrete specimens having different percentage of sodium silicate and the results thus obtained were compared with those of normal concrete. The results indicated that the Sodium silicate does not contribute to an increase in strength of concrete, rather it has reverse effects .However it does increase Compaction Factor, thereby enhancing workability of concrete.

Producing vanadium nitrogen-microalloyed_steelsfabianovallim

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This document discusses the use of vanadium microalloying in steels produced through thin-slab casting and direct charging processes. It notes that these processes differ from conventional steelmaking in ways like using electric arc furnaces, continuous casting into thin slabs, and directly charging slabs without reheating. These differences impact how elements like nitrogen behave and must be considered. The document focuses on how vanadium and nitrogen interact as alloying elements to strengthen steels for this production method.

Met 45 4_287_290_bockusUsman

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1) The study investigated the microstructure and mechanical properties of continuously cast iron products under different casting conditions and chemical compositions. 2) Key findings were that tensile strength, hardness, and pearlite content increased with higher additions of Cr, Cu, Sb and lower carbon equivalent. Higher Si/C ratio and lower solidification rate also decreased the zone of interdendritic graphite. 3) A structural nomograph was developed to show the effects of solidification rate and chemical composition on the microstructure of continuously cast iron.

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VLSI Technology.pptxkiran27822

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The document provides information on VLSI technology course syllabus covering topics such as cleanroom technology, epitaxy, oxidation, diffusion, lithography, etching, and metallization. It discusses the creation of electronic grade silicon from sand through processes like reduction, purification, crystal growth via Czochralski method, wafer shaping through sawing and polishing to produce uniform thickness wafers ready for fabrication.

Study on Processing and Mechanical Properties of nano SiCp reinforced AA7075theijes

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The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published. The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability. Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors. The International Journal of Engineering & Science would take much care in making your article published without much delay with your kind cooperation

Atul msmeAtul Patel

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Bulk metallic glasses are metallic alloys that lack long-range atomic order and behave like liquids in their supercooled liquid region. They can be formed through rapid quenching of alloys with proper alloying additions to improve glass-forming ability. This document discusses experiments adding elements like Si, Au, Ag, Cu, and P to Pd- and Ni-based alloys to enhance thermal stability and glass formation, enabling the production of bulk metallic glass samples. Alloying additions were found to improve properties like plasticity by stabilizing the liquid phase and destabilizing crystalline phases. Potential applications of bulk metallic glasses include aerospace and military materials, biomedical implants, and electronics due to their strength, elasticity,

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VLSI Technology.pptxkiran27822

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Study on Processing and Mechanical Properties of nano SiCp reinforced AA7075theijes

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Atul msmeAtul Patel

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2014 Poster_3_6

1. This study examines the possibility of manufacturing thin sheets of steel in an environmental friendly manner and properties that are superior to conventionally manufactured ones. APT revealed the presence of nano-scale Vanadium rich clusters that were not observable using TEM. Concurrent precipitation of these clusters in vanadium alloyed strip cast steels are responsible for the retarded recrystallization and fine grains. 20 nm Deakin University CRICOS Provider Code: 00113B INTRODUCTION Out of 1.4 billion tonnes of steel manufactured every year, almost 50% are thin flat products. Conventional manufacturing methods demand nearly 1.8x109 Joules of energy to produce one ton of thin strip steel. Alternatively, to eliminate the energy intensive processes, a new and emerging technology is manufacturing steel sheets directly from molten metal by Direct strip casting (DSC). DSC process not only simplifies the production route but also reduces the energy consumption by 90%, thereby reducing the harmful impact on environment. However, rapid conversion of liquid steel into thin steel strips generally results in microstructures and mechanical properties that are different to conventionally manufactured ones. Despite the significant benefits, current limited knowledge about the microstructural development during strip casting and secondary processing is hindering the advancement of DSC process. This project aims to investigate the influence of solute elements, mainly carbon and vanadium, in the microstructural development during strip casting and rolling-annealing process. A multi-scale approach, from microscopic to atomic scale, is utilized to elucidate the solute behaviour in strip cast steels. C-0.09,N-0.01 wt% and V-0.04 wt% EBSD analysis showed that DSC produces a highly complex microstructure with an average grain size of 55 µm. 0 0.2 0.4 0.6 0.8 1 1.E+1 1.E+3 1.E+5 FractionRecrsytallized Time (s) Recrystallization studies showed a significant difference in kinetics as well as the grain size evolution due to Vanadium addition. 0 10 20 30 40 50 60 70 Grainsize(µm) 0wt% V 0.04wt% V 0.04 wt% V Strip-Cast Recrystallized 0 2 4 6 8 10 12 14 16 -1 0 1 2 3 Concentration(at%) Distance (nm) C % N % P % S % Cu % V % ATOM PROBE TOMOGRAPHY Effect of clusters in Direct Strip Cast steels MAHENDRA RAMAJAYAM, A.Prof. NICOLE STANFORD & Prof. PETER HODGSON Institute of Frontier Materials, Geelong Technology Precinct. SIGNIFICANCE RECRYSTALLIZATION 50% Cold Rolling + 650°C annealing DSC MICROSTRUCTURE Matrix Cluster

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2014 Poster_3_6

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